LIGHTFORCE SECURITY KIT 4 NYLON INSERT LOCK NUTS - SKU: ATNKIT Lightforce ATN KIT 4 Pack Small Diameter Head Lock Nuts & Matching Spanner. New and improved, now with four half dome all matching coded nuts with small diameter to protect one set of lights. These sets of 4 lock nuts are designed not only to replace the nut the fixes the lamp to the mounting of your vehicle but also the horizontal cross bolt such as on the Lightforce XGT! The simple to install security nuts will help protect your investment against opportunist "light" fingered thieves. Each kit consists of four half dome coded nuts and one corresponding keyed socket requiring a 21 mm, 13/16" spanner. These nuts will fit all Lightforce driving lights and other lights using a 10 mm bolt (M10 x 1.5).